In 1507 Vasily III gave the order to construct an oak fortress in Tula on the left bank of the Upa River. In 1514 in an oak fortress, like in the Moscow Kremlin, Vasily III issued an order to construct the 'stone city', built in 1520-1521.
In 1552, was besieged by the Crimean khan Devlet I Giray. At that time, Tsar Ivan IV was with campaign against Kazan. Urban population fought before the arrival of reinforcements from the tsar's army from Kolomna. In memory of these events in the Tula Kremlin has been established the foundation stone near the Tower of Ivanovskie Gate.
In the second half of the 16th century, around the stone Kremlin was created Posad - a wooden fortress that more than ten times more the size of the stone Kremlin. This area at the time was the boundary of Tula.
In 1605 bell informed the residents about the arrival of the False Dmitry I and Tula for two weeks turned into pseudo capital of Moscow State. It was here in the Kremlin, came to swear allegiance to the pretender boyars and nobles.
In 1607, during the Peasants' War, the Tula Kremlin became the refuge for Ivan Bolotnikov. Together with people loyal to him, he kept the Kremlin by his control for four months. In 1608 in the Tula Kremlin by Tsar Vasily Shuisky were besieged the leaders of the peasant movement - Ivan Bolotnikov and Ileyko Muromets. Kremlin stand very long siege but was taken due creation a dam of the bags to the ground on Upa River. Water from the river flooded the Kremlin, and the rebels surrendered. In memory of these events in 1953 in the Tula Kremlin was erected an obelisk.
Today Tula Kremlin consists of walls and nine gates and towers.
References:The Walls of Constantinople are a series of defensive stone walls that have surrounded and protected the city of Constantinople (today Istanbul) since its founding as the new capital of the Roman Empire by Constantine the Great. With numerous additions and modifications during their history, they were the last great fortification system of antiquity, and one of the most complex and elaborate systems ever built. They were also the largest and strongest fortification in both the ancient and medieval world.
Initially built by Constantine the Great, the walls surrounded the new city on all sides, protecting it against attack from both sea and land. As the city grew, the famous double line of the Theodosian Walls was built in the 5th century. Although the other sections of the walls were less elaborate, they were, when well-manned, almost impregnable for any medieval besieger.